I have a unique related problem. My left leg calf muscle is almost an inch smaller than my right calf muscle. I just noticed it this year. Felt so weird. Why would there be imbalance in calf muscle growth to such an extreme degree. Then I tried to do a single leg calf raise on the left leg and couldn't do it. I still can't do it after 6-7 months. I must admit I am not training the left calf muscle at all, just the usual running and some sporadic squats.

This could have something to do with motor neurons not firing or something I don't know. I went to a physical therapist who suggested some calf and toe stretches and it seemed ridiculous to me. Like why would I exercise a muscle or a bunch of bones that is not functioning as expected, wouldn't that exacerbate the problem ? He didn't give a convincing answer but this paper makes me think he was spot on.

Isolating and exercising the calf muscles could probably help fire those neurons I don't know.I should do some more study on this. It's not debilitating now but I don't know what will be the impact on my balance 20-30 years from now. I am 47.